<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta content="IE=edge" http-equiv="X-UA-Compatible"/>
    <meta content="width=device-width, initial-scale=1.0" name="viewport"/>
    <link href="./css/inputnumber.css" rel="stylesheet">
    <link href="./css/index.css" rel="stylesheet">
    <title>Title</title>
</head>
<body>

<div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img alt="" src="./img/fruit.jpg"/></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length > 0">
        <div class="table">
            <!-- 头部 -->
            <div class="thead">
                <div class="tr">
                    <div class="th">选中</div>
                    <div class="th th-pic">图片</div>
                    <div class="th">单价</div>
                    <div class="th num-th">个数</div>
                    <div class="th">小计</div>
                    <div class="th">操作</div>
                </div>
            </div>
            <!-- 身体 -->
            <div class="tbody">
                <div :class="{ active:item.isChecked }" class="tr" v-for="(item,index) in fruitList" :key="item.id">
                    <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
                    <div class="td"><img :src="item.icon" alt=""/></div>
                    <div class="td">{{ item.price }}</div>
                    <div class="td">
                        <div class="my-input-number">
                            <button :disabled="item.num <= 0" @click="sub(item.id)" class="decrease"> -</button>
                            <span class="my-input__inner">{{ item.num }}</span>
                            <button :disabled="item.num >= 99" @click="add(item.id)" class="increase"> +</button>
                        </div>
                    </div>
                    <div class="td">{{ item.num * item.price }}</div>
                    <div class="td">
                        <button @click="del(item.id)">删除</button>
                    </div>
                </div>
            </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
            <!-- 全选 -->
            <label class="check-all">
                <input type="checkbox" v-model="isAllChecked"/>
                全选
            </label>
            <div class="right-box">
                <!-- 所有商品总价 -->
                <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span>
                <!-- 结算按钮 -->
                <button class="pay">结算( {{ totalCount }} )</button>
            </div>
        </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
</div>

<script src="../vue.global.js"></script>

<script>
    const {createApp, ref, computed, watch} = Vue;
    createApp({
        setup() {
            const defaultFruitList = ref([
                {
                    id: 1,
                    icon: './img/火龙果.png',
                    isChecked: true,
                    num: 2,
                    price: 6,
                },
                {
                    id: 2,
                    icon: './img/荔枝.png',
                    isChecked: false,
                    num: 7,
                    price: 20,
                },
                {
                    id: 3,
                    icon: './img/榴莲.png',
                    isChecked: false,
                    num: 3,
                    price: 40,
                },
                {
                    id: 4,
                    icon: './img/鸭梨.png',
                    isChecked: true,
                    num: 10,
                    price: 3,
                },
                {
                    id: 5,
                    icon: './img/樱桃.png',
                    isChecked: false,
                    num: 20,
                    price: 34,
                }]);

            const fruitList = ref(JSON.parse(localStorage.getItem('fruitList')) || defaultFruitList.value);

            const del = (id) => {
                fruitList.value = fruitList.value.filter(item => item.id !== id);
            }

            const sub = (id) => {
                const fruit = fruitList.value.find(item => item.id === id);
                if (fruit.num >= 1) {
                    fruit.num--;
                }
            }

            const add = (id) => {
                const fruit = fruitList.value.find(item => item.id === id);
                if (fruit.num < 99) {
                    fruit.num++;
                }
            }

            const isAllChecked = computed({
                get() {
                    // 必须所有的选中才为true
                    return fruitList.value.every(item => item.isChecked);
                },
                set(value) {
                    fruitList.value.forEach(item => item.isChecked = value);
                }
            });

            const totalCount = computed(() => {
                return fruitList.value.reduce((total, item) => {
                    return item.isChecked ? total + item.num : total;
                }, 0);
            });

            const totalPrice = computed(() => {
                return fruitList.value.reduce((total, item) => {
                    return item.isChecked ? total + item.num * item.price : total;
                }, 0);
            });

            watch(fruitList, (newValue) => {
                localStorage.setItem('fruitList', JSON.stringify(newValue));
            }, {deep: true});

            return {fruitList, del, sub, add, isAllChecked, totalCount, totalPrice};
        }
    }).mount('#app');
</script>

</body>
</html>